WinForm窗口最小化到系统托盘

1. 在Form上加notifyicon控件notifyIcon1，为控件的属性Icon添加一个icon图标, Text为鼠标在图标上时显示的tip。

2. 在Form1_SizeChanged中设置Form的ShowInTaskbar属性

3. 在notifyIcon1_Click事件中设置Form的ShowInTaskbar和WindowState属性

4. 添加ContextMenuStrip控件ContextMenuStrip1，右键托盘图标弹出菜单，设置notifyIcon1的ContextMenuStrip属性为ContextMenuStrip1。在ContextMenuStrip1中添加item(退出)。

5. notifyIcon1在MouseClick事件中，判断右键点击 并弹出ContextMenuStrip。

代码：

 1     public partial class Form1 : Form
 2     {
 3         public Form1()
 4         {
 5             InitializeComponent();
 6         }
 7 
 8         private void Form1_FormClosing(object sender, FormClosingEventArgs e)
 9         {
10             this.WindowState = FormWindowState.Minimized;
11             e.Cancel = true;
12         }
13 
14         private void Form1_SizeChanged(object sender, EventArgs e)
15         {
16             if (this.WindowState == FormWindowState.Minimized)
17             {
18                 this.ShowInTaskbar = false;
19             }
20         }
21 
22         private void notifyIcon1_Click(object sender, EventArgs e)
23         {
24             this.ShowInTaskbar = true;
25             this.WindowState = FormWindowState.Normal;
26         }
27 
28         private void 退出ToolStripMenuItem_Click(object sender, EventArgs e)
29         {
30             Application.Exit();
31         }
32 
33         private void notifyIcon1_MouseClick(object sender, MouseEventArgs e)
34         {
35             if (e.Button == System.Windows.Forms.MouseButtons.Right)
36             {
37                 this.contextMenuStrip1.Show();
38             }
39         }
40     }